Only when he returned home what had happened.A. did he realizeB. he realizedC. he did realizeD. has

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【题目】Only when he returned home ______ what had happened.

A. did he realize

B. he realized

C. he did realize

D. has he realized

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【答案】A

【解析】Only强调状语放在句首，引起部分倒装，和现在无关，所以用一般过去时。